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July 31, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry Help
1.) Calculate the number of atoms in 2.58 mol antimony. 2.) Determine the mass of 1.45 mol FePO4. 3.) Calculate the number of mol in 6.75 g of NaCl. 4.) What is the volume, in liters, of 2.54 mol methane (CH4) gas?. 5.) What is the percent composition of B4H10?
Monday, February 10, 2014 at 8:16am

Chemistry
Consider the burning of LPG (propane C3H8)which produces carbon dioxide (CO2) and water vapor (H2O). The balanced chemical equation involving the reaction is C3H8+5O2= 3CO2+4H2O Suppose 1.5 moles of C3H8 will be used, assume the following: a. How many moles of O2 will be ...
Monday, February 10, 2014 at 7:10am

Physical Chemistry
If 20.0mL of 0.122M NaOH are required to reach the first equivalent point of a solution of citric acid(tripotic acid H3C6H5O7).How many mL of NaOH in total are required to reach the second equivalence point?
Monday, February 10, 2014 at 4:07am

Chemistry
How many moles of HCl are consumed by the reaction of .150 moles of magnesium?
Monday, February 10, 2014 at 1:04am

Chemistry
Given dry, powdered Evans Blue, how would you prepare 100 mL of a 500 mg/L stock solution using water as the diluent? I would appreciate any help, even just getting started. Thanks!
Monday, February 10, 2014 at 12:02am

Organic Chemistry
Why is crotyl chloride more reactive than 1-Chlorobutane under SN2 conditions
Sunday, February 9, 2014 at 11:42pm

chemistry
empirical formula of a barium hydroxide hydrate if a sample consists of 3.70 g of barium hydroxide and 2.64 g water.
Sunday, February 9, 2014 at 10:57pm

CHEMISTRY
6. The H atom and the Be3+ ion each have one electron. Does the Bohr model predict their spectra accurately? Would you expect their line spectra to be identical? Explain.
Sunday, February 9, 2014 at 10:12pm

CHEMISTRY
4. The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that eventually reach the brain. (a) How many photons of red light (700.0 nm) are needed? (b) How many photons of blue ...
Sunday, February 9, 2014 at 10:05pm

Chemistry
iron has three main naturally occuring isotopes which can be investigated using a mass spectrometer. The first stage in the operation of the mass spectrometer is vaporization. The iron is then oxidized. Explain why the iron is oxidized. Explain why a very low pressure is ...
Sunday, February 9, 2014 at 9:29pm

chemistry
50.0ml of an aqueous solution of 2.50M H3PO4 are mixed with 75.0 ml of an aqueous solution of 4.00 M Ca(OH)2. The resulting precipitate is washed and isolated using filtration. What mass of Ca3(PO4)2 is obtained?
Sunday, February 9, 2014 at 8:36pm

chemistry
In which of the following pairs of compounds are both members of the pair ionic compounds? Explain a. Pl3 and HBr b. H2S and NCl3 c. LiF and H20 d. LiI and NiO DrBob222 you said you would choose the answer d and I should know how to figure this out. I don't understand the ...
Sunday, February 9, 2014 at 8:17pm

Chemistry
A sample of argon has a pressure of 1.021 atm at a temperature of 89.4 degC. Assuming that the volume is constant, at what temperature will the gas have a pressure of 1016.56 mmHg
Sunday, February 9, 2014 at 8:04pm

Chemistry
A sample of argon has a pressure of 1.021 atm at a temperature of 89.4 degC. Assuming that the volume is constant, at what temperature will the gas have a pressure of 1016.56 mmHg
Sunday, February 9, 2014 at 8:04pm

chemistry
1.)Calculate the number of moles in 3.50 x 10^21 atoms of silver. Show all work. 2.) Calculate the number of atoms in 2.58 mol antimony. Show all work 3.) Determine the mass of 1.45 mol FePO4. Show all work. 4.) Calculate the number of mol in 6.75 g of NaCl. Show all work. 5...
Sunday, February 9, 2014 at 8:01pm

Chemistry
Hi I was hoping to get some help on this. It's review for my chemistry text on Monday and I would be grateful if someone could help me out. My teacher has been out for two weeks but we still have to know this material. 1. The following data was collected for the reaction ...
Sunday, February 9, 2014 at 7:05pm

chemistry
Assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0.30mm .
Sunday, February 9, 2014 at 7:03pm

chemistry
the correct formula for the ionic compound containing Tl^3+ and Te^2- ions would be: a. TlTe b. Tl3Te2 c. Tl2Te3 d. Tl2Te
Sunday, February 9, 2014 at 6:54pm

Chemistry
6 separate questions. I have figured out the other 20 questions I am stuck. Please help Thanks The correct name for the ionic compound Al2Se3 is? The correct name for the ionic compound Fe2Se3 is? the Roman numerall III in the name Iron(III)oxice indicates what? Which of the ...
Sunday, February 9, 2014 at 6:49pm

AP Chemistry- Equilibrium
If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
Sunday, February 9, 2014 at 6:39pm

AP Chemistry- Equilibrium
If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
Sunday, February 9, 2014 at 6:39pm

chemistry
What [Ag1+] is required to start precipitation of AgOH from a saturated solution of Mg(OH)2? Ksp = 2.4 ✕ 10-8 for AgOH and Ksp = 2.6 ✕ 10-11 for Mg(OH)2
Sunday, February 9, 2014 at 6:38pm

chemistry
In which of the following pairs of compounds are both members of the pair ionic compounds? Explain a. Pl3 and HBr b. H2S and NCl3 c. LiF and H20 d. LiI and NiO
Sunday, February 9, 2014 at 6:35pm

chemistry
the correct formula for the ionic compound containing Tl^3+ and Te^2- ions would be: Please show. thank you
Sunday, February 9, 2014 at 5:29pm

Chemistry HELP
Complete combustion of 3.30 g of a hydrocarbon produced 10.2 g of CO2 and 4.68 g of H2O. What is the empirical formula for the hydrocarbon? I did the calculation and the ratio comes out to C: 1 H: 2.24 So I thought the answer is CH2 but apparently its wrong. Anyone help..
Sunday, February 9, 2014 at 5:03pm

Chemistry
a chemist wants to make 5.5L of a .3M Cacl2 solution. What mass of CaCl2 should the chemist use?
Sunday, February 9, 2014 at 4:35pm

Chemistry
Find the mass of carbon dioxide that can be produced from 0.01 mols of calcium carbonate
Sunday, February 9, 2014 at 4:33pm

chemistry
A 25.0-ml sample of 1.00M KBr and a 75.0-ml are mixed. The solution is then heated to evaporate water until the total volume is 50.0 ml. What is the Molarity of the KBr in the final solution
Sunday, February 9, 2014 at 3:47pm

chemistry
With a halogen X, a metal M forms ionic compounds MX, MX2 and MX3. The lattice energies of the compounds are -1340, -3840 and -7020 kJ/mol, respectively. The ionization energies of the metal are 360 (for M+), 1236 (M2+) and 2990 (M3+) kJ/mol and the sublimation energy is 334 ...
Sunday, February 9, 2014 at 8:50am

Chemistry
The Haber process is used to synthesize ammonia from hydrogen and nitrogen. How much hydrogen is required to produce 42.8 kg of ammonia?
Sunday, February 9, 2014 at 5:34am

chemistry
where can I use Group I and II anions in the field of medicine especially as a medtech student?
Sunday, February 9, 2014 at 2:06am

chemistry
An unknown compound contains only carbon, hydrogen, and oxygen (CxHxOx). Combustion of 3.50G of this compound produced 5.13G of carbon dioxide and 2.10G of water A.How many moles of carbon, , were in the original sample? b. How many moles of hydrogen, , were in the original ...
Saturday, February 8, 2014 at 8:27pm

Chemistry
Write the chemical formula and number of ions formed when the following electrolyte dissolves in water. Make sure to include appropriate states. K3PO4 = ??? Any help with this is greatly appreciated!
Saturday, February 8, 2014 at 5:04pm

Chemistry (Analytical) followup
Thanks DrBob for answering the question! I was assuming it was something similar to that, but my confusion is that a follow up question is asking what happens to the dissolved Ca2+ if the pH is reduced to 2, so the pH has some effect, but I don't know what.
Saturday, February 8, 2014 at 3:41pm

Chemistry
I have .8ml of 35% by weight hydrogen peroxide. The hydrogen peroxide density is 1.14 g/ml. how many moles of hydrogen peroxide are there?
Saturday, February 8, 2014 at 2:46pm

Chemistry
A titration involves titrating 0.4 M NaOH into a solution of 0.2 M H3PO4. a.) Calculate the volume of NaOH that will be required to reach the first equivalence point. b.) Calculate the volume of NaOH required to reach the second equivalence point. Other information: 10 ml ...
Saturday, February 8, 2014 at 2:03pm

Chemistry (Analytical)
Solve for the number of grams of Ca2+ ion in a solution prepared by adding 1.00 gram of calcium oxalate (Ksp=1.3x10^-8)powder to 100 mL at pH 9.
Saturday, February 8, 2014 at 12:00pm

chemistry
How much dry solution would it take to prepare 135 0.120M NaNO3 to a sovent?
Saturday, February 8, 2014 at 11:52am

Chemistry
Alcoholic drinks contain ethanol. 10cm3 of ethanol is called one unit of alcohol. Men are advised to drink a maximum of 21 units of ethanol a week, while women are advised to drink a maximum of 14 units. Wine contains about 14% ethanol by volume. A) a bottle of wine contains ...
Saturday, February 8, 2014 at 10:36am

chemistry
what are the reaction steps of the reaction between ferric chloride with hydrogen at 600 degree celsius
Saturday, February 8, 2014 at 2:50am

Chemistry
What is the typical 13 c nmr chemical shift range in ppm?
Friday, February 7, 2014 at 3:03pm

college chemistry
kilocalories released when 20.0 g of steam condenses at 100 degrees C. and the liquid cools to 0 degrees C.
Friday, February 7, 2014 at 2:26pm

Chemistry
Rank Cd, Br, and Si from worst to best conductor of electricity. Is it Br, Cd, Si? Thanks -MC
Friday, February 7, 2014 at 12:33pm

chemistry
2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?
Friday, February 7, 2014 at 9:46am

chemistry
Divers know that the pressure exerted buy the water increases about 100kpa with every 10.2 m of depth. This means that at 10.2 m below the surface, the pressure is 201 kpa; at 20.4 m , the pressure is 301 Kpa; and so forth. Given that the volume of a balloon is 3.5L at STP and...
Friday, February 7, 2014 at 8:55am

Chemistry
It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...
Thursday, February 6, 2014 at 10:25pm

Chemistry
I'm doing something wrong with osmolarity. I have 100 ml of .9% NaCl. So what i did was take the MW (58.44) and divided it by the .9 because it should be grams, then divided that number by .1 (for the liters) but its coming out with a huge number and its not supposed to. I...
Thursday, February 6, 2014 at 9:23pm

Chemistry
Calculate the amount of energy in calories that is needed to melt 45g of ice at -20°C and then increase the temperature to 95°C
Thursday, February 6, 2014 at 8:43pm

Chemistry
how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?
Thursday, February 6, 2014 at 8:19pm

Chemistry
A 0.960mol quantity of Br2 is added to a 1.00 L reaction vessel that contains 1.23mol of H2 gas at 1000 K. What are the partial pressures of H2, Br2, and HBr at equilibrium? At 1000 K, Kp=2.1×106 and ΔH∘ = -101.7 kJ for the reaction H2(g)+Br2(g)⇌2HBr(g...
Thursday, February 6, 2014 at 8:03pm

CHEMISTRY
A 85.2-mg sample of the compound X4O10 contains 48.0 mg of oxygen atoms. What is the atomic mass of element X?
Thursday, February 6, 2014 at 6:10pm

Chemistry
A 85.2-mg sample of the compound X4O10 contains 48.0 mg of oxygen atoms. What is the atomic mass of element X?
Thursday, February 6, 2014 at 5:37pm

Chemistry
Use the periodic table and predict the number of electrons that will be lost or gained by the following elements as they change into simple ions. Write an equation using elemental symbols, ionic symbols, and electrons to represent each change. a) Ca b) Aluminum c) Fluorine d) ...
Thursday, February 6, 2014 at 4:10pm

chemistry
Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.180 M pyridine, C5H5N(aq) with 0.180 M HBr(aq): 1)before addition of any HBr 2)after addition of 12.5 ml of HBr: 3)after addition of 16 ml of HBr: 4)after addition of 25 ml of HBr: 5)after ...
Thursday, February 6, 2014 at 11:05am

Chemistry
6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) ==> 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many milliliters of 0.0750 M K2Cr2O7(aq) will react with 0.038 mol of FeCl2(aq)? I used the equation Molarity=Mole/Volume and divided my answer by 1000 to get milliliters. I'...
Thursday, February 6, 2014 at 10:32am

Chemistry
In a high temperature corrosion cell we have 5 vol% O2 and 500 vppm HCl. We know at high temperature the reaction is Deacon Process (600C) 4HCl(g)+O2(g)=2Cl2(g)+2H2O(g). We have thermodynamic phase diagram of a system (e.g., Fe-O2-Cl2) at 600 (log pO2 - x axis and log pCl2 in ...
Thursday, February 6, 2014 at 4:44am

chemistry
This equation decribes oxidation of acidified solution of sodium oxalate(Na2C2O4) by potassium permanganate(KMnO4): 5 C2O4^2- + 2Mn04^- + 16H2SO4 to produce 10Co2 + 2Mn^2- + 16HSO4^- + 8H2O. what volume of 0.127M sodium oxalate in sulphuric acid will react with 3.57g of ...
Thursday, February 6, 2014 at 1:00am

chemistry
1.64 L of a 4.95 M solution is diluted to form a 2.58 M solution. (Rounded to 3 sig figs) there are __________ L of the 2.58 M solution formed.
Wednesday, February 5, 2014 at 11:15pm

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
Wednesday, February 5, 2014 at 9:52pm

Chemistry
Calculate the formula mass for each of the following halogen compounds to five or more significant figures:? bake asked 5 months ago (a) NaIO3 (antiseptic) (b) CCl2F2 (former refrigerant)
Wednesday, February 5, 2014 at 9:37pm

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
Wednesday, February 5, 2014 at 9:35pm

General Chemistry
How do the vapour pressure of two substance at the same temperature but with different strengths of the inter-molecular forces compare. Give a molecular explanation of why this is so.
Wednesday, February 5, 2014 at 9:15pm

chemistry
convert the value of the vapour pressure (149.4 torr) at 60 degree celsius to atm
Wednesday, February 5, 2014 at 8:46pm

Chemistry
Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). How do they react with iodine? How do they react with water? How do they react with oxygen? Which reacts the most vigorously? Which element in the group is the most ...
Wednesday, February 5, 2014 at 8:27pm

Chemistry
Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). How do they react with iodine? How do they react with water? How do they react with oxygen? Which reacts the most vigorously? Which element in the group is the most ...
Wednesday, February 5, 2014 at 8:26pm

Chemistry
complete the equation. Na + H2-->
Wednesday, February 5, 2014 at 8:06pm

Chemistry
complete the equation. Na + H2-->
Wednesday, February 5, 2014 at 7:52pm

Chemistry
Suppose a student titrates a 10.00-mL aliquot of saturated Ca(OH)2 solution to the equivalence point with 13.65 mL of 0.0234 M HCl. What was the initial [OH − ]? What is the experimental value of Ksp?
Wednesday, February 5, 2014 at 6:58pm

Ap Chemistry
Adding or taking away small amounts of water in a reaction that takes places in an aqueous solution ____________________ affect the overall concentration of water.
Wednesday, February 5, 2014 at 5:44pm

chemistry
a .50 sample if vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ are given off. what id the caloric value, in kcal/g
Wednesday, February 5, 2014 at 5:31pm

AP Chemistry
what is the pKa of an acid that has a pH of 7.4 at neutralization and has to have 25 mL added to neutralize it
Wednesday, February 5, 2014 at 5:28pm

Chemistry AP
What are the concentrations of benzoic acid and sodium benzoate in a solution that is buffered with a pH of 4.55 and has a freezing point of -2.0 degrees Celsius? (assume complete dissociation and a density of 1.01g/mL for the solution.)
Wednesday, February 5, 2014 at 2:54pm

Chemistry
Balance equation. been working on this for almost 5 hours now, just cant do it. HCl+As2O3+NaNO3+H2O-->NO+H3AsO4+NaCl
Wednesday, February 5, 2014 at 1:47pm

Chemistry
The temperature of 550. g of water is increased from 16.0 degrees Celsius to 28.2 degrees Celsius by burning fuel. How many joules of energy is needed to increase the temperature of the water to 28.2 degrees?
Wednesday, February 5, 2014 at 12:46pm

chemistry
What is the percent recovery if you begin with 0.482 grams of copper and recover 0.325 g? Include one decimal place in the answer and do not include the % sign. Answer
Wednesday, February 5, 2014 at 12:30pm

Chemistry
Magnesium metal reacts with phosphoric acid to produce hydrogen gas. If 50 g of phosphoric acid is used, how much magnesium metal is needed? How much hydrogen gas is produced?
Wednesday, February 5, 2014 at 11:54am

Chemistry
Aspirin, C9H8O4 , is produced through the following reaction of salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3(s) + C4H6O3(l) ---> C9H8O4(s) + HC2H3O2(l) A. What mass of aspirin (kg) could be produced from 75.0 mol of salicylic acid? B. What mass of acetic ...
Wednesday, February 5, 2014 at 10:39am

chemistry
6 part question 1. describe the appearance of a Bunsen flame that is getting insufficient air? 2. describe the appearance of a Bunsen flame that is getting too much air. 3. When inserting glass tubing into a rubber stopper, how far from the stopper should you hold the tubing? ...
Wednesday, February 5, 2014 at 8:13am

chemistry
The normal boiling point of Rh is 3727°C. What is its vapor pressure in mm Hg at 2914°C, if its heat of vaporization is 557.0 kJ/mol?
Wednesday, February 5, 2014 at 12:32am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

Chemistry
When 3.10 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 26 °C, the solution exerts an osmotic pressure of 821 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of ...
Tuesday, February 4, 2014 at 11:17pm

Chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Tuesday, February 4, 2014 at 8:39pm

ap chemistry
What is the ratio of the molarities of PO3^4- and HPO4^2− ions in a buffer solution having a pH of 13.16? What mass of K3PO4 must be added to 1 L of 0.1 M K2HPO4(aq) to prepare a buffer solution with a pH of 13.16? Answer in units of g What mass of K2HPO4 must be added ...
Tuesday, February 4, 2014 at 7:18pm

ap chemistry
What is the pH at the equivalence point in the titration of 10.0 mL of 0.56 M HZ with 0.200 M NaOH? Ka = 6.6 × 10−5 for HZ.
Tuesday, February 4, 2014 at 7:16pm

ap chemistry
What is the pH at the point during a titration when 34 mL of 0.200 M HCl has been added to 29 mL of 0.0500 M NH3 solution? HCl is a strong acid, Kb=1.8×10−5 for NH3. Answer in units of pH
Tuesday, February 4, 2014 at 7:16pm

Chemistry
5. On the basis of a solubility curve for KNO3 what type of substance would you expect KNO3 to be? Choices: solid liquid gas It is impossible to tell. I don't want the answer. All I want to know is, can you tell whether something is a liquid/solid/gas just by using a ...
Tuesday, February 4, 2014 at 7:14pm

ap chemistry
Calculate the pH at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (C2H5NH2) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 250.0 mL. Kb for ethylamine is 4.7 × 10−4.
Tuesday, February 4, 2014 at 7:04pm

ap chemistry
Calculate the ratio of [NH3]/[NH4+] that gives a solution of pH = 10.60.
Tuesday, February 4, 2014 at 7:03pm

ap chemistry
How many moles of sodium acetate (NaCH3COO) must be added to 1.000 liter of a 0.500M solution of acetic acid (CH3COOH) to produce a pH of 5.027? The ionization constant of acetic acid is 1.8 × 10−5. Answer in units of mol
Tuesday, February 4, 2014 at 7:00pm

ap chemistry
The ionization constant of HF is 7.2 × 10−4. What is the molar concentration of H+ in a solution which is 0.353 molar in HF and 0.145 molar in KF?
Tuesday, February 4, 2014 at 6:59pm

chemistry
Two naturally occurring isotopes exist for the hypothetical element dippium. 25.0 percent of dippium atoms have a relative mass of 17.0 amu and 75.0 percent a relative mass of 21.3 amu. What is the atomic mass of dippium? Please show the work thanks
Tuesday, February 4, 2014 at 6:59pm

ap chemistry
What mass of solid sodium formate (of MW 68.01)must be added to 125 mL of 0.48 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.07? Ka = 0.00018 for HCOOH. Answer in units of g
Tuesday, February 4, 2014 at 6:58pm

ap chemistry
What is the concentration of hydrogen ions in a solution containing 0.785 M HOCN (cyanic acid) and 0.659 M (NaOCN) (sodium cyanate)? The ionization constant of cyanic acid is 3.5 × 10−4. Answer in units of M
Tuesday, February 4, 2014 at 6:57pm

ap chemistry
What is the concentration of H+ ions in a buffer solution containing 0.305 M benzoic acid (with ionization constant 6.5 × 10−5)and 0.834 M sodium benzoate (a salt of benzoic acid)?
Tuesday, February 4, 2014 at 6:56pm

ap chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 680 mL of solution. What is the pH of this buffer? Ka = 2.4×10−6 for HA.
Tuesday, February 4, 2014 at 6:34pm

Chemistry
A solution is 3.00M NaCl. The solution density is 1.05 g/mL. Calculate the molality?
Tuesday, February 4, 2014 at 6:12pm

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